The solution was rediscovered independently by me and the German scholar Erhard Blum in the late 1980s, though we were both anticipated by Rabbi Samuel ben Meir, known as Rashbam, c. 1100 C.E. See Propp, “The Rod of Aaron and the Sin of Moses,” Journal of Biblical Literature 107 (1988), pp. 19–26; Erhard Blum, Studien zur Komposition des Pentateuch, Beihefte zur Zeitschrift für die alttestamentliche Wissenschaft 189 (Berlin: de Gruyter, 1990), pp. 271–278.